Am 11.05.2011 09:53, schrieb DELAFOSSE, Gilbert:
MarkusYou already have a pseudo VAXstation with "off the shelf" tools You only need - Simh - an X11 emulator (Xming or Cygwin in the Windows world) That's it. You can even have Simh AND X11 running on the same machine With a brand new PC, you will outperform any VAXstation (Except perhaps the VAXstation 8000) Runnig a VAXstation on a laptop is great
Yes and no.Infact, you can run a VAX simh and install the X client software in VMS and redirect the client to almost any X server (including a local Xming). This is comparable to having a physical VAX with attached X terminals. Emulating the hardware the native VMS X server expects is here not useful, as you correctly remarked; it
unnecessarily drains performance from the emulator.But this will solve the problem for any platform which already talks the lingua franca X11. Imagine any other workstation of that time, for instance an Apollo Domain that had its own windowing system incompatible to X11. Either you run it in text mode or through serial terminals, or you are forced to emulate some sort or more or
less intelligent bitmap video device.This brings up the matter of GUI again. I am unsure about an API for such a bitmap device to become useful, particularly when it comes to devices that are outsourced to an external networked process. The streaming model used with ordinary text terminals (ESC sequences) is not suitable here; very fast you end up with a real protocol which we already have: the X protocol. But this then makes implementation very expensive even when
you use higher level libraries like Motif, Qt, or SDL (in contrast to Xlib). -- Holger
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